基于响应面的大型输电塔结构有限元模型动力修正

Dynamic updating of a large transmission tower's finite element model based on response surface methodology

针对基于灵敏度分析的有限元模型动力修正方法计算效率较低、迭代收敛慢的不足,将响应面法引入500 kV大跨越输电塔基准模型修正。选择塔脚弹性支承刚度为修正参数,依次进行单因素试验、样本值计算、响应面建立与分析、参数优化。修正后,有限元模型非常准确地复现了单塔横、纵两个方向的一阶弯曲动态特性,修正效果与基于灵敏度分析的模型修正方法接近,证明响应面法在有限元模型动力修正领域的应用价值。还探讨了塔架结构修正参数的选取问题,为相关研究提供参考。

To conquer deficiencies of poor computational efficiency and slow convergence of traditional sensitivity analysis-based finite element（FE） model updating methodology used widely,response surface methodology was introduced into a 500kV large transmission tower＇s dynamic FE model updating.Based on authors＇ former contributions,elastic stiffnesses of the tower＇s three directional foot bearings were selected as parameters to be updated.Key steps in updating process including one factor test,sample on FE platform,building and analyzing response surface and parameter optimization were presented in succession,then response surface-based dynamic FE model updating was completed.The updated tower model accurately recurred the structure＇s primary and secondary natural frequencies,and its effect was close to that of the sensitivity analysis-based methodology,its application value was proved.The problem of parameter selection for model updating of pylon structures was also explored.